Question

1. Which equation represents the axis of symmetry of the function y= -2x^2 + 4x -6?

A. y=1
B. x=1
C. x=3
D. x= -3

2.What are the coordinates of the vertex of the graph of the function y= -x^2 + 6x -11?

A. (3,-2)
B.(3,16)
C.(-3, -29)
D. (-3,-20)

Answer 1

\(\bf \textit{vertex of a parabola}\\ \quad \\
y = {\color{red}{ a}}x^2+{\color{blue}{ b}}x+{\color{green}{ c}}\qquad
\qquad \quad
\left(-\cfrac{{\color{blue}{ b}}}{2{\color{red}{ a}}}\quad ,\quad {\color{green}{ c}}-\cfrac{{\color{blue}{ b}}^2}{4{\color{red}{ a}}}\right)\)

so find their respective vertex, and thus the axis of symmetry

Answer 2

Anyone else